From: Kevin Rodgers <kevin.d.rodgers@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Re: some vi equivalents please?
Date: Sat, 01 Nov 2008 07:32:58 -0600 [thread overview]
Message-ID: <gehlq2$r12$1@ger.gmane.org> (raw)
In-Reply-To: <490B1DAD.8000205@dr-qubit.org>
Toby Cubitt wrote:
> rustom wrote:
>> 1. In vi I can delete a line that contains a <pat> with
>> :g/<pat>/d
>>
>> How is this done in emacs?
>
> M-x query-replace-regexp
>
> then enter "^.*<pat>.*$" as the regexp (no quotes), and leave the
> replacement blank.
>
>
>> 2. match-variables:
>> If I want to remove everything after the second : (in a file that has
>> 3 fields separated with two :'s)
>> I do
>> :s/\(.*\):\(.*\):.*/\1 \2
>> How do I do that in emacs?
>
> M-x query-replace-regexp
>
> then "^[^:]*\(.*\):\(.*\):.*$" for the regexp, and "\1 \2" for the
> replacement (again, no quotes).
>
> The "^" and "$" both here and above are only there to prevent the regexp
> matching across lines (unlike sed, regexp searches in an Emacs buffer
> aren't line-oriented). Depending on your file, you might get away with
> something simpler. E.g. for 2, if you know there will always be two
> colons on every line, you could use "\(.*?\):\(.*?\):.*" instead ("?"
> makes a wildcard non-greedy).
>
> query-replace-regexp is interactive, like query-replace. I find this
> useful just to check I've got the regexps right, and then hit "!" once
> I'm happy with it to replace all the rest non-interactively. The
> non-interactive version is replace-regexp.
Good advice!
> There are no doubt many other ways to accomplish this in Emacs...
Since rustom is used to vi's noninteractive way of using sed-like
commands:
C-M-h ; mark-whole-buffer
C-u M-| ; shell-command-on-region
sed '/<pat>/d'
C-M-h ; mark-whole-buffer
C-u M-| ; shell-command-on-region
sed 's/^\([^:]*\):\([^:]*\):.*$/\1 \2/' ; note the trailing /
--
Kevin Rodgers
Denver, Colorado, USA
next prev parent reply other threads:[~2008-11-01 13:32 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-31 15:08 some vi equivalents please? rustom
2008-10-31 15:01 ` Toby Cubitt
2008-11-01 13:32 ` Kevin Rodgers [this message]
2008-11-01 18:47 ` Reiner Steib
2008-10-31 15:53 ` Teemu Likonen
2008-10-31 15:59 ` Drew Adams
2008-10-31 16:01 ` Parker, Matthew
2008-10-31 16:53 ` Giorgos Keramidas
2008-10-31 17:22 ` Joost Kremers
2008-10-31 17:34 ` Giorgos Keramidas
2008-10-31 22:49 ` Xah
[not found] ` <mailman.2577.1225468814.25473.help-gnu-emacs@gnu.org>
2008-11-01 14:45 ` rustom
2008-11-01 14:52 ` rustom
2008-11-01 16:40 ` Giorgos Keramidas
2008-11-01 17:07 ` Drew Adams
[not found] ` <mailman.2646.1225559243.25473.help-gnu-emacs@gnu.org>
2008-11-02 15:30 ` rustom
2008-11-02 16:12 ` Drew Adams
[not found] ` <mailman.2710.1225642363.25473.help-gnu-emacs@gnu.org>
2008-11-03 7:19 ` rustom
2008-11-03 9:10 ` Drew Adams
2008-11-03 16:24 ` Giorgos Keramidas
2008-11-05 13:41 ` Ken Goldman
2008-11-06 7:08 ` rustom
2008-11-06 16:50 ` Drew Adams
2008-11-07 17:12 ` Johan Bockgård
2008-11-07 17:38 ` Drew Adams
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